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Calculate the Gibbs free energy change of a rubber band stretched to 5 times its original length with concurrent contractions in its other two dimensions of 2.24 times at 25 C. The number of rubber molecules per unit volume, N, for a typical rubber is about N?10NA #/m^3 , where NA is Avogadro’s number.
a thin-walled circular tube must support a torque of 6 kn.m and a pure bending moment of 4.4 kn.m. if the wall
a brinell hardness measurement is made on a nickel alloy using a 0.01 m diameter sphere of tungsten carbide. a load of
A refrigerator uses a R-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s.
an 0.5 m3 rigid tank contains equal volumes of freon-12 vapor and freon-12 liquid at 312k. additional freon-12 is added
a 1050 hot-rolled steel of diameter 300mm has an ultimate tensile strength of sut724mpa that is hot-rolled is exposed
an experiment is to be conducted to determine heat transfer coefficient on the surfaces of tomatoes that are placed in
Steam at 120 bar and 520 ?C enters a control volume operating at steady state with a volumetric flow rate of 460 m3/min. Twenty-two percent of the entering mass flow exits at 10 bar, 220 ?C and a velocity of 20 m/s. The rest exits at another location..
A piston cylinder device initially contains compressed liquid water at 20degreesC and 200kPa. It is heated in an isobaric process (process 1) until it contains only saturated liquid. At this point it occupies a volume of 0.0021m3.
air at 1175k 8 bar enters a turbine operating as steady state and expands adiabatically to an exit state of 1 bar. the
steam enters an adiabatic turbine at 800 psia and 900f and leaves at a pressure of 40 psia. determine the amount of
Nitrogen (N2) gas at 100 kPa and 298 K enters a compressor steadily with a mas flow rate of 2 kg/s. The nitrogen leaves at 800 kPa and 580 K. Asume the compressor is well insulated. Do NOT assume the specific heats of the nitrogen as constant or a li..
the carpenter builds the square frame abcd and then braces it with member ef as shown in order to prevent racking
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